package com.tchintech.pay.utils;

import android.annotation.TargetApi;
import android.graphics.Bitmap;
import android.os.Build;
import android.widget.ImageView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

import java.util.Hashtable;

/**
 * Created by Administrator on 2017/7/13 0013.
 * 生成二维码
 */

public class CreateQRImageTest {
    private int QR_WIDTH = 200, QR_HEIGHT = 200;
    // 要转换的地址或字符串,可以是中文
    @TargetApi(Build.VERSION_CODES.KITKAT)
    public void createQRImage(String url, ImageView imageView) {

        try {
            // 判断URL合法性
            if (url == null || "".equals(url) || url.length() < 1) {
                return;
            }

            Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");

            hints.put(EncodeHintType.MARGIN, 1);
            // 图像数据转换，使用了矩阵转换
            BitMatrix bitMatrix = new QRCodeWriter().encode(url,
                    BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);

            int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
            // 下面这里按照二维码的算法，逐个生成二维码的图片，
            // 两个for循环是图片横列扫描的结果
            for (int y = 0; y < QR_HEIGHT; y++) {
                for (int x = 0; x < QR_WIDTH; x++) {
                    if (bitMatrix.get(x, y)) {
                        pixels[y * QR_WIDTH + x] = 0xff000000;
                    } else {
                        pixels[y * QR_WIDTH + x] = 0xffffffff;
                    }
                }
            }
            // 生成二维码图片的格式，使用ARGB_8888
            Bitmap bitmap = Bitmap.createBitmap(200, 200,
                    Bitmap.Config.ARGB_8888);
            bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);
            // 显示到一个ImageView上面
            imageView.setImageBitmap(bitmap);
        } catch (WriterException e) {
            e.printStackTrace();
        }
    }
}
